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comparison: gfx/skia/trunk/include/core/SkImageEncoder.h
gfx/skia/trunk/include/core/SkImageEncoder.h
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| -1:000000000000 | 0:886a1b513b5b |
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| 1 | |
| 2 /* | |
| 3 * Copyright 2011 Google Inc. | |
| 4 * | |
| 5 * Use of this source code is governed by a BSD-style license that can be | |
| 6 * found in the LICENSE file. | |
| 7 */ | |
| 8 #ifndef SkImageEncoder_DEFINED | |
| 9 #define SkImageEncoder_DEFINED | |
| 10 | |
| 11 #include "SkTypes.h" | |
| 12 #include "SkTRegistry.h" | |
| 13 | |
| 14 class SkBitmap; | |
| 15 class SkData; | |
| 16 class SkWStream; | |
| 17 | |
| 18 class SkImageEncoder { | |
| 19 public: | |
| 20 enum Type { | |
| 21 kUnknown_Type, | |
| 22 kBMP_Type, | |
| 23 kGIF_Type, | |
| 24 kICO_Type, | |
| 25 kJPEG_Type, | |
| 26 kPNG_Type, | |
| 27 kWBMP_Type, | |
| 28 kWEBP_Type, | |
| 29 }; | |
| 30 static SkImageEncoder* Create(Type); | |
| 31 | |
| 32 virtual ~SkImageEncoder(); | |
| 33 | |
| 34 /* Quality ranges from 0..100 */ | |
| 35 enum { | |
| 36 kDefaultQuality = 80 | |
| 37 }; | |
| 38 | |
| 39 /** | |
| 40 * Encode bitmap 'bm', returning the results in an SkData, at quality level | |
| 41 * 'quality' (which can be in range 0-100). If the bitmap cannot be | |
| 42 * encoded, return null. On success, the caller is responsible for | |
| 43 * calling unref() on the data when they are finished. | |
| 44 */ | |
| 45 SkData* encodeData(const SkBitmap&, int quality); | |
| 46 | |
| 47 /** | |
| 48 * Encode bitmap 'bm' in the desired format, writing results to | |
| 49 * file 'file', at quality level 'quality' (which can be in range | |
| 50 * 0-100). Returns false on failure. | |
| 51 */ | |
| 52 bool encodeFile(const char file[], const SkBitmap& bm, int quality); | |
| 53 | |
| 54 /** | |
| 55 * Encode bitmap 'bm' in the desired format, writing results to | |
| 56 * stream 'stream', at quality level 'quality' (which can be in | |
| 57 * range 0-100). Returns false on failure. | |
| 58 */ | |
| 59 bool encodeStream(SkWStream* stream, const SkBitmap& bm, int quality); | |
| 60 | |
| 61 static SkData* EncodeData(const SkBitmap&, Type, int quality); | |
| 62 static bool EncodeFile(const char file[], const SkBitmap&, Type, | |
| 63 int quality); | |
| 64 static bool EncodeStream(SkWStream*, const SkBitmap&, Type, | |
| 65 int quality); | |
| 66 | |
| 67 protected: | |
| 68 /** | |
| 69 * Encode bitmap 'bm' in the desired format, writing results to | |
| 70 * stream 'stream', at quality level 'quality' (which can be in | |
| 71 * range 0-100). | |
| 72 * | |
| 73 * This must be overridden by each SkImageEncoder implementation. | |
| 74 */ | |
| 75 virtual bool onEncode(SkWStream* stream, const SkBitmap& bm, int quality) = 0; | |
| 76 }; | |
| 77 | |
| 78 // This macro declares a global (i.e., non-class owned) creation entry point | |
| 79 // for each encoder (e.g., CreateJPEGImageEncoder) | |
| 80 #define DECLARE_ENCODER_CREATOR(codec) \ | |
| 81 SkImageEncoder *Create ## codec (); | |
| 82 | |
| 83 // This macro defines the global creation entry point for each encoder. Each | |
| 84 // encoder implementation that registers with the encoder factory must call it. | |
| 85 #define DEFINE_ENCODER_CREATOR(codec) \ | |
| 86 SkImageEncoder *Create ## codec () { \ | |
| 87 return SkNEW( Sk ## codec ); \ | |
| 88 } | |
| 89 | |
| 90 // All the encoders known by Skia. Note that, depending on the compiler settings, | |
| 91 // not all of these will be available | |
| 92 /** An ARGBImageEncoder will always write out | |
| 93 * bitmap.width() * bitmap.height() * 4 | |
| 94 * bytes. | |
| 95 */ | |
| 96 DECLARE_ENCODER_CREATOR(ARGBImageEncoder); | |
| 97 DECLARE_ENCODER_CREATOR(JPEGImageEncoder); | |
| 98 DECLARE_ENCODER_CREATOR(PNGImageEncoder); | |
| 99 DECLARE_ENCODER_CREATOR(WEBPImageEncoder); | |
| 100 | |
| 101 // Typedef to make registering encoder callback easier | |
| 102 // This has to be defined outside SkImageEncoder. :( | |
| 103 typedef SkTRegistry<SkImageEncoder*(*)(SkImageEncoder::Type)> SkImageEncoder_EncodeReg; | |
| 104 #endif |
